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Net Interest Expense
 12 Months Ended
Dec. 31, 2019
Interest Income (Expense), Net [Abstract]  
Net Interest Expense Net interest expense
(in millions of Canadian dollars)
2019

2018

2017

Interest cost
$
471

$
475

$
491

Interest capitalized to Properties
(17
)
(20
)
(16
)
Interest expense
454

455

475

Interest income
(6
)
(2
)
(2
)
Net interest expense
$
448

$
453

$
473



Interest expense includes interest on finance leases of $11 million for the year ended December 31, 2019 (2018 – $11 million; 2017 – $11 million).